22653221 has 2 divisors, whose sum is σ = 22653222. Its totient is φ = 22653220.

The previous prime is 22653203. The next prime is 22653233. The reversal of 22653221 is 12235622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11356900 + 11296321 = 3370^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 22653221 - 2¹⁴ = 22636837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22658221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11326610 + 11326611.

It is an arithmetic number, because the mean of its divisors is an integer number (11326611).

Almost surely, 2^22653221 is an apocalyptic number.

It is an amenable number.

22653221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22653221 is an equidigital number, since it uses as much as digits as its factorization.

22653221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 22653221 is about 4759.5399987814. The cubic root of 22653221 is about 282.9501883054.

Adding to 22653221 its reverse (12235622), we get a palindrome (34888843).

The spelling of 22653221 in words is "twenty-two million, six hundred fifty-three thousand, two hundred twenty-one".